Parallel Interface (Reverse Channel) - Epson Stylus Color 400 Service Manual

Chapter1 Product Description

1.3.2 Parallel Interface (Reverse Channel)

[Transmission mode]
[Synchronization]
[Handshaking]
[Data trans. timing]
[Signal level]
[Adaptable connector]
[Extensibility request]
Note) The printer sends following device ID string when it is requested.
00H
MFG
CMD
MDL
CLS
Note) [00H] denotes a hexadecimal value of zero. MDL value depends on the EEPROM setting.
Note) MDL value depends on the EEPROM setting. Model name can be changed by changing a
certain address in the EEPROM.
The table below shows pin assignment for reverse channel(*3). In these case of signals, twist pair line
is used and returning side is connected to Signal GND.(*3): Reverse channel is the mode that any data is
transferred from the printer to the PC.
Pin No. Signal Name
1 HostClk
2-9 Data0-7
10
11 PtrBusy, Data Bit-3,7
12 AckDataReq, DataBit-2,6
13 Xflag, DataBit-1,5
14 HostBusy
31
32 /DataAvail, DataBit-0,4
36 1284-Active
18 Logic-H
35
17 Chassis GND
16,33,19-30
15,34
Note) In/Out refers to the direction of signal flow from the printer's point of view.
1-16
: IEEE-1284 nibble mode
: Refer to the IEEE-1284 specification
: Refer to the IEEE-1284 specification
: Refer to the IEEE-1284 specification
: IEEE-1284 level 1 device
: TTL compatible level
: 57-30360(amphenol) or equivalent
: The printer responds affirmatively when the extensibility
request values are 00H or 04H, that mean,
00H :Request Nibble Mode Reverse Channel Transfer.
04H :Request device ID; Return Data using Nibble Mode Rev
Channel Transfer.
Table 1-10. Device ID Description
EPSON
ESCPL2,BDC
Stylus[SP]Color[SP] 400
PRINTER
Table 1-11. Pin Assignment for Reverse Channel
Return
GND pin
19
20-27
PrtClk 28
29
28
28
30
/INIT 30
29
30
+5V
GND
NC
3CH
Production Maker
Command system
In/Out
In Host clock signal.
In The DATA0 through DATA7 signals
represent data bits 0 to7, respectively.
Each signal is at high level when data
is logical 1 and low level when data is
logical 0. These signals are used to
transfer the 1284 extensibility request
values to the printer.
Out Printer clock signal.
Out Printer busy signal and reverse
channel transfer data bit 3 or 7.
Out Acknowledge data request signal and
reverse channel transfer data bit 2 or
6.
Out X-flag signal and reverse channel
transfer data bit 1 or 5.
In Host busy signal.
In Not used.
Out Data available signal and reverse
channel transfer data bit 0 or 4.
In 1284 active signal.
- Out Pulled up to +5V via 3.9K ohm resister.
- Out Pulled up to +5V via 3.3K ohm resister.
- - Chassis GND.
- - Signal GND.
- - Not connected.
Contents
Model name
Class
Functional description
Rev. A